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@uiten gisten atrnt @fitta GEORGE E. HAYES, OF BUFFALO, NEW YORK, ASSIGNORTO BUFFALO DENTAL MANUFACTURING COMPANY, OF SAME PLAGE.

Letters .Patent No. 78,974, dated February 4, 1868.

IMPROVEMENT IN DENTISTS FLASKS.

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TO ALL WHOM IT MAY OONCERN:

Be it known that I, GEORGE E. HAYES, of'Buffalo, in the county of Erie, and State of New York, have invented a. new and useful Improvement in Vulcanizing-Flaslrs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specieation, and in which* Figure 1 represents a plan of a vuleani'zing-iiask for dentists use, constructed according to my invention, and

Figure 2 a longitudinal vertical section of the same.

Similar letters of reference indicate corresponding parts. Y

This, my invention, is designed more especially for dental vulcanite work, and consists in constructing the interior of vulcanizing-tlasks with-a cavity that is in connection with the mould, and which is made to receive a portion of the rubber, and in providing an opening to ,the'said cavity through the side of the ilask, and iitting said opening with a piston or plunger that acts upon the rubber in the cavity to eifect a perfect {ill-ing of the mould.

By way of more clearly explaining this, my improvement, ita may here be well to remark that, in a general way, but two methods have hitherto been adopted for filling the moulds with rubber in preparing dental vulcanitc work. The one, and most common', is to place all the rubber (in its raw state) required for a certain work, inthe mould, andthen to bring the sectionsof the ilask togetherby means of screws or. other pressingdevices, so as to force the rubber to its'place in the mould. This plan or method of working does not admit of the sections of the ilask being fully closed before applying vthe necessary pressure, and involves the necessity of handling al hot flask whiley the rubber is being packed. The other methodis to place the rubber inthe cylinder of what Vmay be termed a separate force-pump, which is put in connection with the ilaslcor mould, and power applied to the pump to lforce the plastic rubber into the flask or mould, but this plan requires a comparatively. expensive mechanism, which is separate and distinct from the ask, andtakes considerable time to fill the empty mould, besides a largeexpenditure of power. These objections are obviated by this, my improvement, as will appear from the following description' of it. l y

In the accompanying drawing, A and ZB are the two sections of a ilask, and C D the plaster or other suit able mould therein. I This iiask, as formed by the united sections A and B, has an opening, a, made in the one side of it, within which a piston o r plunger, E, is inserted. When `the mould is to be made in the viiaslr, this plunger is pressed forward to project a given distancewithin the flask, so that on pouring the liquid plaster into the mould, it will surround it and the tooth-model 6r pattern at the same time, leaving a cavity, b, in the mould. So soon as the plaster has set, and before opening the mould, the plunger E should be drawn back, which may be done by slaekening a forcing-screw, F, that iits through- .an extension, e, of a. iiasl holder, G, provided, it may be, with a handle, h, and sliding back a box, oZ, with which the plunger is connected, preferably in a free and detachable manner, and with which the screw F gears by a collar, e. The ask is then opened, und the pattern or model removed in. the usual Way. The raw rubber is then inserted in the mould, without, of necessity, the prior application of heat to the latter, by cutting it into strips and placing the greater portion required for a single filling within the mould proper or impression left by the model, but not filling or stocking it toari extent that will prevent the flask afterwards closing freely. After this, the vbalance of the rubber is inserted in thecavity b' left by the-plunger. This vbeing done, the ilaskis closed and securely fastLv cned, and the plunger then introduced through the opening Wand the whole heated up to the boilingpoint of water, or thereabouts, so Aas to soften the rubber, and the plunger E worked forward, say, by the screw F, to gradually force the softenedy rubb'ercut of the cavity b into the mould, and so to compress with any desired force, and add to thc rubber previously supplied the mould proper, to lill every part of thelatter. This accom: plished, any surplus or remaining rubber will be withdrawn withfthe plunger on working it back, or by interposa ing tin-foil or other suitablematerialbetween the rubber' and endof the piston the surplus may be left in the haelt. The opening ais then closed with plaster or aplggaiidf. the whole" then readyto be passed over to the vutcauizer. i 't What is here'claimed and desiredto be secured by Letters Patent, is 1. The process, substantially asherein described, of' filling vulcanizing-laskshor the moulds contained therein, by constructing the ask with` a side opening, a, and forming a cavity, b, in `the mould, by a plunger,

I E, combined or connected in a direct manner with said flask, and, after having first packed the mould proper,

also the cavity b communicating therewith, with rubber and.olosing the flask, projecting the plunger through the cavity in the flask -to'prcss upon the rubber, substantially aspspeoied. i

2. The moulds C and D,- pjrovided' with ,an enlarged cavity, b, in communication with a side opening, a, made in the flask for reception ofva portion ofthe requisite amount of rubber necessary to ll the mould, essen- .tially as herein set forth. l y i i 8. The combination, With. aivuloanizing-lask having a. sido opening, a, in it, of a plunger, E, for operation therein, substantially as specified.

" GEO. E.HAYES.

Witnesses:

CHAS. B. BROWN, J. E. Roem, 'Jr'. 

